Danby Quarry in Danby, Vermont

Since it began operating in 1903, Danby Quarry has grown to become the largest underground marble quarry on the planet. Its tunnels, ramps, and vast caverns twist and turn to a depth of 1.5 miles, and its marble has been used in famous structures including the Jefferson Memorial and the U.S. Supreme Court building.

The quarry entrance into Dorset Mountain looks the same as it did a century ago. But while the square-cut mining shaft is the same entry shaft used in 1903, Danby Quarry has...

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